William s



(NojModel.)

W.- S. BARSTOW. HBLIOSTAT ORYPORTB LUMIERE.

' 10.292,198. Patented Jan. 22, 1884.

i N. PETERS muuu-magnum, washington n,c.

Uivrrnn STATESr PATENT Ori-ICEa VILLIAM S. BARSTOVV, OF BROOKLYN, NEV YORK.

HELIOSTAT ou PORTE LUMIRE. Y'

SPECIFICATION forming part of Letters Patent No. 292,193, dated January 22, i884.`

- Application led Oetoberhl. (No model.)

Z'o all whom, t mag/cmwerru: l turebeneath the lens-opening B in the board.

Be it known that 1,WILLIAM S. BARsToW, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvementin Heliostats or Porte Lumieres?" for YVindows; and I do hereby declare that the following-is a full and exact description thereof, reference being hadto the accompanying drawings, and tothe letters ofv reference marked thereon, making a part of this specification.

My invention relates to a heliostat or porte lumiere designed to reflect the sunlight from an outer adjustable mirror in through a suitable opening tted with a tube and lens or lenses upon a screen or wall in an otherwise darkened room, for the purpose of illuminat- In the accompanying drawings, Figure 1 is a view in perspective of my improved porte lumiere adjusted for use; Fig. 2, a longitudinal central section through the same, its position in a window being Aindicated by the dotted lines 5 and Fig. 3 is a detached view of a portion of the mirror and'its support, illustrating a modification inthe form 'of the spring for actuating the mirror.

A represents a board or plate adapted to the support of the apparatus, and whose edges are preferably rabbeted, to permit it to be readily iitted vertically, either directly in the frame of a window between the sash raised for the purpose and the sill, (see dotted lines, Fig. 2,) or into 'a board or frame provided with an opening to receive it, and itself fitted to the window-opening. The board A is provided with a central opening, B, in which is fitted a double-convex lens, B', and over the inner side of said opening is secured, by detachable fastenings, a case, C, fitted with ad-v justable telescopic tubes D D', in the outer end of which is placed the second 1ens,-E. A pin or shaft, F, is led through a central aper- A, so as to rotate therein, and is itted upon the outer end of the shaft F by lmeansof a rectangular opening or socketin the Amiddle of the bar, adapted to fit upon the squared end of the shaft, to which it is made fast by means of aVcatch-spring., H. In the ends of the bar G, which is thus fitted to oscillate upon the pin F against the outer face of the board, two parallel rods, J J, are fitted to project therefrom with a slight upward inclination, so that their outer ends shall be on a level with the center of the lens-opening B when the board A is secured in a vertical position. rods J J is pivoted a suitable mirror, K. The lower end of the mirror is made to swing outward by means of a spiral spring, a, `one end Between the outer ends of these of which is attached thereto, the other end of thespring being made fast to the end of an.

arm, J, projecting downwardfrom the supporting rod J, the resiliency of the spring tending to draw Aoutward the lower end of the mirror. i j

Fig. 3 illustrates a 'mbdiiication in the application of the spring to the mirror, consisting in the interposition upon the supportingshaft,bet\veen the mirror and the rod'J, of a helical spring, a, (see Fig. 3,) so that one arm of the spring shall engage with the rod J and its free end shall rest against the facev ofthe mirror below its point of suspension and' operate to swing the lower portion outward. v

From the lower end of one edge of the mirror a cord, L, is led to a guide-ring, M, on the outer face of the board A, above the lens-opening B, and thence to apulley, O, upon the end of a pin or shaft, P, extending through the board A, to be rotated by a hand wheel or verse pivotal axis between therods J J, produced by turning the wheel or crank Q and IOO Fsecured within the window-frame.

R represents an upright ease, to be used in connection with the mirror and lenses, for the support of the objects which are to be illuminated by the solar rays. This case is mounted and supported upon a base-board, It', secured to the upright board A, to project inwardly therefrom at a right angle therewith, and is made adjustable thereon to and from the 1enstube. It is constructed with a lower forward opening, S, on one side, and with an upper rear opening, S, above its center on its opposite side. A mirror, T, is fixed within the case opposite the lower opening` S, at a suitable angle to reiiect the rays of light falling thereon directly upward, and a second mirror, T, is fixed within the case opposite the upper opening, so that the rays oflight diverted upward shall be reflected outward through the opening Si, to fall upon a screen or wall in the room.

A plate of clear glass, S, upon which to place the objects to be illustrated, is interposed within the ease between the mirrors T T', and the light made to pass through them will cause their image to be clearly displayed by refleclt1on upon the screen. This device avoids the necessity of mounting theobjccts in slides. The second lens, E, may be fitted over t-he transparent plate S', between it and the mirror T', instead of in the end of the lens tube D. Where the objects are mounted in slides, these are inserted for exhibition in a slide-opening, \V, formed in the ease C, so that the rays of light entering from the lens B may pass through the same.

The apparatus thus simply Constructed and tted together admits of being easily taken apart and pacled in a small compass. By

lifting the spring-catch H, the plate G, rods J J, and mirror K are readily removed from the board A. The case C and lenses D D are also readily detached and removed from the board, as also the arm or plate R' and the auxiliary case R.

I claim as my inventionl. The combination, in a window-heliostat, with a vertical supporting-board provided with a lens-opening and suitable lens-tubes, of a detachable bar pivoted centrally against the board upon the outer end of a pivotal pin or shaft led through the board,to`,be operated from the inside, a spring-catch for securing the bar to the pivot-pin, parallel rods extending from each end of said bar, and a mirror pivoted between the ends of said rods, all substantially in the manner and for the purpose herein set forth.

2. The combination, in a window-heliostat, with a vertical supporting-board provided with a lens-opening and fitted with suitable lens-tubes secured thereon, of parallel rods adapted to revolve upon a common pivotal axis at a right angle to the board, a mirror pivoted between said arms, a spring actuating said mirror to force its lower end outward, and a cord leading from the lower end of the mirror to apulleyrotatinginbearings intlleboard, to provide for the vertical adjustment of the mirror, substantially in the manner and for the purpose herein set fort-h.

3. The combination, with a board or frame, A, adapted for insertion in the window or other opening, and provided with an opening, B, to receive a lens and tube, and a mirror, K, supported outside of said board upon pivotal supports admitting of its adjustment both in line parallel with the board and about an axis at right angles thereto, a case, R, fitted upon a supporting-base projecting from the board on the side opposite the mirror, and provided with an opening in line with the lens-opening on the board, a mirror, T, fixed within the ease opposite said opening at an angle therewith, a second mirror, T', fixed in the top of the case parallel with the iirst,to deflect the rays thercfrom through an opening, S2, in the front oil the ease, and a transparent plate, S, interposed between the mirrors, all substantially in the manner and for the purpose herein set forth. In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

'M. S. BARSTOV'. XVitiicsscs:

A. B. Moolen, A. XV. STEIGr-r.. 

